CN215116525U - Radio astronomy electromagnetic environment monitoring system - Google Patents
Radio astronomy electromagnetic environment monitoring system Download PDFInfo
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- CN215116525U CN215116525U CN202121464749.3U CN202121464749U CN215116525U CN 215116525 U CN215116525 U CN 215116525U CN 202121464749 U CN202121464749 U CN 202121464749U CN 215116525 U CN215116525 U CN 215116525U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 46
- 230000000737 periodic effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses a radio astronomy electromagnetic environment monitoring system, including antenna H1, antenna H2, antenna H3 and antenna H4, input and antenna H1, antenna H2, the first radio frequency switch S01 that antenna H3 and antenna H4 one-to-one are connected, the second radio frequency switch S02 of being connected with first radio frequency switch S01, the amplifier L01 of being connected with the output one-to-one of second radio frequency switch S02, amplifier L02, amplifier L03, amplifier L04 and amplifier L05, third radio frequency switch S03 with amplifier L01, amplifier L02, amplifier L03, amplifier L04 and amplifier L05' S output connection, and the spectrometer of being connected with third radio frequency switch S03. By the proposal, the utility model has the advantages of application scope is wide, simple structure, detection are reliable.
Description
Technical Field
The utility model belongs to the technical field of the radio monitoring technique and specifically relates to a radio astronomy electromagnetic environment monitoring system.
Background
Currently, radio monitoring technology in the prior art mainly monitors radio communication services, and radio astronomical electromagnetic environment monitoring in the present document mainly monitors signals interfering with radio astronomical services and evaluates electromagnetic environment. In the prior art, the monitoring of the electromagnetic environment of the radio astronomy generally only aims at the monitoring of a single radio astronomy service, or the monitoring and analysis of the interference are carried out after the interference is found in the radio astronomy observation. For example, in the test method of the Xinjiang astronomical table, the monitoring is only carried out on the frequency band of 1000MHz-2600MHz, the monitoring frequency band is narrow, and the method is suitable for a specific radio astronomical telescope.
In addition, the existing monitoring technology does not analyze the radio service, monitoring can not be carried out and monitoring tasks can not be reasonably arranged according to the characteristics of the radio astronomical service and the radio communication service in the monitoring process, and monitoring parameters are set only according to the specific radio astronomical service, such as the setting regulations of Resolution Bandwidth (RBW), scanning frequency span, integration time, data acquisition points and the like are rigid. Meanwhile, in the prior art, antenna parameters such as the directivity of the monitoring antenna are strictly specified, the directional antenna is used for monitoring, the application range is not wide, the number of monitoring direction points is large, the monitoring time is long, and the monitoring data is incomplete.
In the prior art, a monitoring system is arranged on a radio astronomical telescope, and can only reflect the interference condition monitored by an antenna aperture surface of the radio astronomical telescope aiming at the observable sky area of the radio astronomical telescope, but can not completely reflect the actual condition of the radio astronomical electromagnetic environment, particularly the radio interference condition from the ground. Since the electromagnetic interference generated on the radio astronomy is mainly affected by the ground radio communication signals.
The prior art stipulates that the noise temperature of a monitoring system is lower than 2000K, the sensitivity requirement is not enough, and the requirements of radio astronomy on the noise temperature and the sensitivity of the monitoring system for electromagnetic environment evaluation cannot be met. Moreover, in the prior art, only a spectrogram of a monitoring frequency band is required to be drawn in the aspect of monitoring result processing, and the influence degree of radio interference on radio astronomy cannot be reflected.
Therefore, there is an urgent need to provide a radio astronomy electromagnetic environment monitoring system with wide application range, simple structure and reliable detection.
SUMMERY OF THE UTILITY MODEL
To the above problem, an object of the utility model is to provide a radio astronomy electromagnetic environment monitoring system, the utility model discloses a technical scheme as follows:
a radio astronomy electromagnetic environment monitoring system comprises an antenna H1, an antenna H2, an antenna H3 and an antenna H4, a first radio frequency switch S01 with the input ends connected with the antenna H1, the antenna H2, the antenna H3 and the antenna H4 in a one-to-one correspondence mode, a second radio frequency switch S02 connected with the first radio frequency switch S01, an amplifier L01, an amplifier L02, an amplifier L03, an amplifier L04 and an amplifier L05 which are connected with the output ends of the second radio frequency switch S02 in a one-to-one correspondence mode, a third radio frequency switch S03 connected with the output ends of the amplifier L01, the amplifier L02, the amplifier L03, the amplifier L04 and the amplifier L05, and a spectrometer connected with the third radio frequency switch S03.
Preferably, the antenna H1, the antenna H2, the antenna H3 and the antenna H4 are all log periodic antennas, and the frequency ranges are 0.85-26.5GHz, 0.07-2GHz and 0.07-2GHz in sequence.
Preferably, the antenna H1, the antenna H2, the antenna H3, the antenna H4 and the first radio frequency switch S01 are connected by cables, and the lengths of the cables are: 0.15m, 0.13m, 3m and 3 m.
Preferably, the third radio frequency switch S03 is connected to the spectrometer by a cable, and the length of the cable is 9 m.
Preferably, the frequency range of the amplifier L01 is 0.05-1 GHz; the frequency range of the amplifier L02 is 1-8 GHz; the frequency range of the amplifier L03 is 8-12 GHz; the frequency range of the amplifier L04 is 12-16 GHz; the frequency range of the amplifier L05 is 16-22 GHz.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model discloses set up antenna H1, antenna H2, antenna H3 and antenna H4 ingeniously, it can monitor the measurement to 30MHz-20000MHz frequency channel scope, is applicable to applications such as the monitoring of the site selection of all kinds of radio astronomical telescopes and radio telescope interference analysis in service.
(2) The utility model discloses can be to monitoring parameter: the scanning frequency span, the intermediate frequency bandwidth, the number of scanning points, the scanning time, the detection mode and the like are set, and the requirements of different radio astronomy electromagnetic environment monitoring can be met.
(3) The utility model discloses a set up log periodic antenna and amplifier, its main monitoring comes from the radio interference on ground, requires monitoring system noise temperature to be less than 300K to take technical means to make monitoring system reach due sensitivity level, in order to satisfy radio astronomy electromagnetic environment monitoring requirement.
(4) The utility model discloses mainly to the radio interference who comes from ground, monitoring range covers and comes from 360 degrees of ground horizontal direction, and the actual conditions of radio astronomy electromagnetic environment can be reflected comprehensively to the monitoring result.
To sum up, the utility model has the advantages of application scope is wide, simple structure, detection are reliable, have very high practical value and spreading value in radio monitoring technology field.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as a limitation of the scope of protection, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an insertion loss test chart of the rf switch of the present invention.
Fig. 3 is a test chart of the cable loss of the present invention.
Fig. 4 is the system noise temperature calibration test chart of the present invention.
Detailed Description
To make the objectives, technical solutions and advantages of the present application more clear, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
As shown in fig. 1, the present embodiment provides a radio astronomical electromagnetic environment monitoring system, which includes an antenna H1, an antenna H2, an antenna H3, an antenna H4, a first radio frequency switch S01, a second radio frequency switch S02, a third radio frequency switch S03, an amplifier L01, an amplifier L02, an amplifier L03, an amplifier L04, an amplifier L05 and a spectrometer. In the present embodiment, the terms "first", "second", and the like are used only for distinguishing the similar components, and are not to be construed as limiting the scope of protection.
The performance parameters of the various components are set forth in detail below:
first portion, antenna:
the system antenna is arranged on two supports with rotating mechanisms, the height of each support is higher than 5 meters, two pairs of log periodic antennas (namely an antenna H1, an antenna H2, an antenna H3 and an antenna H4) are arranged on each support, the coverage frequency of the system antenna is 70 MHz-22 HGz, and the antenna parameters are as follows:
the second part comprises radio frequency switches S01-S03 and cables C01-C05:
as shown in fig. 2, the rf switches S01 to S03 switch different antennas and amplifiers according to frequency bands and polarization modes to form various paths. 87106C of Agilent, USA, is selected, and the insertion loss is according to the formula 0.3+0.015 Xf (GHz) dB.
As shown in fig. 3, the rf cable of this embodiment selects a low-loss high-frequency cable, and since the noise temperature depends on the devices of the first stage, the length of each cable section should be as short as possible before the amplifier, and the lengths of the cables are as follows:
| cable with a protective layer | Length (m) | Connection of |
| C01 | 0.15 | HL050 S01-6 |
| C02 | 0.13 | HL050 S01-5 |
| |
3 | HL023 S01-4 |
| |
3 | HL033 S01-3 |
| C05 | 9 | S03 SA |
According to the monitoring requirement, before each monitoring task is started, the system noise temperature is calibrated by using a broadband noise source. A346C broadband noise source of Agilent is selected, the frequency range is 10MHz-26.5GHz, and the parameters of the Excess noise ratio (process noise ratios) are shown in the following table:
third section, amplifier:
amplifiers are key components in the system and determine the noise temperature of the system. A high-gain low-loss amplifier is selected, and the specific parameters are as follows:
fourth part, frequency spectrograph:
the spectrometer of the present embodiment employs FSP-30, which is a general purpose spectrometer manufactured by rodde and schwarz, germany, providing minimal measurement uncertainty and superior radio frequency performance, and is mature in product technology and excellent in function, performance, reliability and practicality. Frequency range: starting at 20Hz, to 30GHz, 10Hz to 10MHz, the average noise level is shown to be-155 dBm (normalized to 1 Hz). The noise temperature of the spectrometer of this example is shown in the following table:
as shown in fig. 4, the system noise temperature, noise figure and gain are calculated according to the present embodiment, and the results are as follows:
from the above results, it can be seen that the present embodiment has good monitoring performance and sensitivity in the frequency band of 30MHz to 20000 MHz.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not limitations on the protection scope of the present invention, but all the changes made by adopting the design principle of the present invention and performing non-creative work on this basis shall fall within the protection scope of the present invention.
Claims (5)
1. A radio astronomical electromagnetic environment monitoring system is characterized by comprising an antenna H1, an antenna H2, an antenna H3 and an antenna H4, a first radio frequency switch S01 with the input end correspondingly connected with the antenna H1, the antenna H2, the antenna H3 and the antenna H4 one by one, a second radio frequency switch S02 connected with the first radio frequency switch S01, an amplifier L01, an amplifier L02, an amplifier L03, an amplifier L04 and an amplifier L05 correspondingly connected with the output of the second radio frequency switch S02 one by one, a third radio frequency switch S03 connected with the outputs of the amplifier L01, the amplifier L02, the amplifier L03, the amplifier L04 and the amplifier L05, and a spectrometer connected with the third radio frequency switch S03.
2. The system according to claim 1, wherein the antenna H1, the antenna H2, the antenna H3 and the antenna H4 are log periodic antennas, and the frequency ranges are 0.85-26.5GHz, 0.07-2GHz and 0.07-2GHz, respectively.
3. The system according to claim 1, wherein the antenna H1, the antenna H2, the antenna H3, the antenna H4 and the first rf switch S01 are connected by cables, and the lengths of the cables are: 0.15m, 0.13m, 3m and 3 m.
4. A radio astronomical electromagnetic environment monitoring system according to claim 1 or 3, wherein said third rf switch S03 is connected to a spectrometer by a cable, and the cable length is 9 m.
5. The system according to claim 1, 2 or 3, wherein the frequency range of the amplifier L01 is 0.05-1 GHz; the frequency range of the amplifier L02 is 1-8 GHz; the frequency range of the amplifier L03 is 8-12 GHz; the frequency range of the amplifier L04 is 12-16 GHz; the frequency range of the amplifier L05 is 16-22 GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121464749.3U CN215116525U (en) | 2021-06-30 | 2021-06-30 | Radio astronomy electromagnetic environment monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121464749.3U CN215116525U (en) | 2021-06-30 | 2021-06-30 | Radio astronomy electromagnetic environment monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215116525U true CN215116525U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121464749.3U Expired - Fee Related CN215116525U (en) | 2021-06-30 | 2021-06-30 | Radio astronomy electromagnetic environment monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215116525U (en) |
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2021
- 2021-06-30 CN CN202121464749.3U patent/CN215116525U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211210 |